Condensation product and related composition and process of making the same.



JAMES P. A. MOGOY, OF WTLKINSBUJRG, PENNSYLVANIA, ASSIGNOR T WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

oonnnnsarronr rnonuo'r ANDTRELATED oOMrosrrIon AND rnocnss or axine rnn SAME.

ggfifi yg specification of Letters Patent.

No Drawing.

To allwhom it may concern:

Be it known that T, Jar/res, P. A. MoCox, a subject of the King of Great Britam. and a resident of Wilkinsburg,in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Condensation Products and Related Compo- .htl

sitionsand Processes of Making the Same, of which the following is a specification.

My invention relates to the manufacture of condensation products and moldedarticles containing such products, and it has for its object to prepare phenolic condensation products which shall form suitable ingredients in molded electrical insulation and other molded compositions. 1

A further object of my inventionis to provide new and highly efficient insulating compositions comprising the condensation products described above. 7

T have discovered that pyrogallol may be caused to react with certain bodies containing an active methylene groups to produce hard, insoluble condensation products. This reaction is assisted by the presence of gum arabic, and it appears that, when a mixture of gumarabic and pyrogallol undergoes oxidation, some of the benzene nuclei of the pyrogallol are split up and that condensation of the mixture results in the formation of complex naphthalene bodies. The resulting resinous condensation product is colored a deep red, which seems to indicate that a part of the pyrogallol reacts to form a purpurogallin. Whatever may be the reactions involved, a resinous product is produced which is Well suited for use in making certain molded compositions, especially for electrical insulating purposes. v According to one suitable manner of carrying out the foregoing process, I mix substantially equal parts of pyrogallol and gum arabic, as is done in the preparation of the dyestufi purpurogallin, and to this mixture. I add about 5% of its weight of a polymer of formaldehyde such as trioxymethylene (meta-formaldehyde) or para-formaldehyde. If this mixture is subjected to heat and pressure, it is transformed into the resinous condensation productsdescribed above, and, in its final stage of condensation, it is a deep red, lustrous mass which is hard, infusible and insoluble in ordinary solvents.

Application filed r m 12, 1915. serial mam.

appended claims.

In'preparing molded compositions accordmg to a further development of my invene the foregoing ingredients, in substantially the proportions stated, about of their weight of a filler such as sawdust, wood flour, or comminuted asbestos, the exact amount of which may be widely varied according to the'characteristics which .it is desired to impart to the resulting compositions. The

Patented Dec. a," rare.

1 tion, I add to the mlxture, prepared from stood that no limitations are to be imposed thereupon except such as are indicated n the I claim as my invention:

1. The process of makingcondensation products that comprises mixing pyrogallol and a substance containing an acting methylene group and subjecting the said mixture to heat and pressure. 1

2. The process of making condensation products that comprises mixing pyrogallol and a polymer offormaldehyde and subjecting the said mixture'to heat and pressure.

' 3. The process of making condensation products that comprises mixing pyrogallol mixture to heat and pressure.

products that comprises mixlng pyrogallol,

and trioxymethylene and subjecting the said V i gum arabic and a substance containing an active methylene group and subjecting the.

said mixture to heat and pressure.

5. The process of ma'kin. products that comprises mixing pyrogallol, gum arabic and a polymer of formaldehyde and subjecting the said mixture to heat and pressure.

6. The process of making productsthat comprises mixing pyrogallol, gum arabic and trioxymethylene and subcondensation condensation r jecting the said mixture to heat and pressure.

7; The process of making condensation products that comprises mixing substantially equal parts of pyrogallol and gum" rot arabic and a polymer jof formaldehyde amounting to about of the'said mixture and subjecting the mixture to heat and pres- 8; The process of making molded compositions that comprises mixing pyrogallol,

' gum arabic, a substance containing an active ,p'ositlons that comprises mixing substanmethyllene group, ing t e said mixture to heat and pressure.

9. The process of making molded compositions that comprises mixing pyrogallol, gum arabic, a. polymer of formaldehyde and a filler, and compressing the said mixture in a hot mold.

10. The process of making molded comand a filler, and subjectme s lol and a substance containing an active methylene group.

12. A condensation product of pyI-ogailol and a polymer of formaldehyde.

13. A condensation product of pyrogallol and trioxymethylene,

14. A condensation product of; pyrogallol, gum arabic and a substance containing an active methylene group.

15. A condensation product of pyrogullol, gum arabic and trionymethylene.

16. A molding composition comprising a condensation product of pyrogullol and a substance containing an active methylene group. -17. A molding composition comprising a condensation product of pyrogallol and a polyner of formaldehyde.

In testimony whereof I have hereunto subscribed my name this th day of March, 1915.

JAMES P. A. MCCOY. 

